diff --git a/SubMind.py b/SubMind.py
index 559281a..7868dab 100644
--- a/SubMind.py
+++ b/SubMind.py
@@ -126,6 +126,8 @@ def init_db():
             cursor.execute("ALTER TABLE subscriptions ADD COLUMN reminder_on_due_date BOOLEAN DEFAULT TRUE")
         if 'notes' not in columns:
             cursor.execute("ALTER TABLE subscriptions ADD COLUMN notes TEXT")
+        if 'last_reminded_date' not in columns:
+            cursor.execute("ALTER TABLE subscriptions ADD COLUMN last_reminded_date DATE")
 
         cursor.execute('''
             CREATE TABLE IF NOT EXISTS categories (
@@ -346,9 +348,11 @@ def update_past_due_dates():
 async def check_and_send_reminders(context: CallbackContext):
     logger.info("Running job: Checking for subscription reminders...")
     today = datetime.date.today()
+    today_str = today.strftime('%Y-%m-%d')
     with get_db_connection() as conn:
         cursor = conn.cursor()
-        cursor.execute("SELECT * FROM subscriptions WHERE reminders_enabled = TRUE AND next_due IS NOT NULL")
+        # 过滤掉今天已经提醒过的订阅
+        cursor.execute("SELECT * FROM subscriptions WHERE reminders_enabled = TRUE AND next_due IS NOT NULL AND (last_reminded_date IS NULL OR last_reminded_date != ?)", (today_str,))
         subs_to_check = cursor.fetchall()
 
     for sub in subs_to_check:
@@ -388,11 +392,15 @@ async def check_and_send_reminders(context: CallbackContext):
                     parse_mode='MarkdownV2',
                     reply_markup=keyboard
                 )
+                # 记录今天已发送提醒
+                with get_db_connection() as update_conn:
+                    update_cursor = update_conn.cursor()
+                    update_cursor.execute("UPDATE subscriptions SET last_reminded_date = ? WHERE id = ?", (today_str, sub['id']))
+                    update_conn.commit()
+                logger.info(f"Reminder sent for sub_id {sub['id']}")
 
         except Exception as e:
             logger.error(f"Failed to process reminder for sub_id {sub.get('id', 'N/A')}: {e}")
-
-
 # --- 命令处理器 ---
 async def start(update: Update, context: CallbackContext):
     user_id = update.effective_user.id
@@ -1311,7 +1319,7 @@ async def edit_new_value_received(update: Update, context: CallbackContext):
             await update.effective_message.reply_text("错误：未选择要编辑的字段。")
         return ConversationHandler.END
     db_field = EDITABLE_SUB_FIELDS.get(field)
-    if not db_field:
+    if not db_field or not db_field.isidentifier():
         if update.effective_message:
             await update.effective_message.reply_text("错误：不允许编辑该字段。")
         logger.warning(f"Blocked unsafe field update attempt: {field}")